Armchair



FIG. 1 is a front perspective view of the armchair;

FIG. 2 is a top view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a rear view thereof. 

CLAIM The ornamental design for an armchair, as shown and described. 